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introduction to apache poi – the ja*a api to read write microsoft docu*ents – excel. apache poi provides pure ja*a libraries for reading and writing files in microsoft office formats, such as word, powerpoint and excel. it has different components for reading and writing different microsoft office files: poifs for ole 2 docu*ents hssf and xssf for excel docu*ents hwpf and xwpf for word docu*ents hslf and xslf for powerpoint docu*ents hpsf for ole 2 this is a frequently asked interview question of ja*a because people always gets confused with these terms and used interchangeably. i will try to explain these terms in easy words. there are three stages for writing a code in any programming language – development , compilation and execution. in ja*a programming language, there are three. testng tutorials 69 : rerun failed test method using iretryan*lyzer interface – implementing as a listener –. hello folks, we have already learnt about iretryan*lyzer interface in previous post. we know why we use it and how can we use it. from previous post, you know that we can pas* implemented clas* of iretryan*lyzer as an value to attribute named “retryan*lyzer” at @test annotation. you need to add it each and every @test annotation. testng tutorials 68 : rerun failed test method using iretryan*lyzer interface – implement using retryan*lyzer attribute in the @test. hello folks, testng provides a built in mechanism to re-run failed test case for n times (ideally) instantly using iretryan*lyzer interface. it means that if a test method fails, we can rerun it for n times or until it is pas*ed during run. let’s see this concept in more details: iretryan*lyzer interface: iretryan*lyzer is an interface. frequently asked ja*a program 28: ja*a program to find if given number is a perfect number. perfect number: a perfect number is a positive integer that is equal to the sum of its proper divisors excluding the number itself. for example: take number 6. its divisors are 1, 2 , 3 and 6. when we add all divisors except 6 ( as it is number itself) (i.e. 1+2+3= 6),